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id'ivrrnn STATES PATENT OFFICE.

HENRY M. FITZHUGH, OF BAY CITY, MICHIGAN, ASSIGNOR OF THREE- SIXTHS OF HIS RIGHT TO STEPHEN E. BABCOCK, THEODORE E. HASLEHURST, ANI) JESSE B. ANTHONY, OF TROY, NEW YORK, ONE- SIXTH TO EACH.

SPECIFICATION forming part of Letters Patent No. 231,300, dated August 17, 1880.

Application filed April 29, 1880. (Model.)

To all whom 'it may concern Be it known that I, HENRY M. FITZHUGH, of Bay City, in the county of Bay and State of Michigan, have invented certain Improvements in Coverings for Steam and Hot-Air Pipes, of which the following is a specification; and I do hereby declare that in the same is conta-ined a full, clear, and exact description of my said invention, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

This invention relates to a complex covering for steam o1' hot-air pipes to reduce the radiation of heat therefrom, and thereby prevent to some extent the loss resulting from the condensation of the steam or hot air contained in the said pipes.

The said invention consists, first, in inclosin g a steam or hot-air pipe in and by a casing having a bright metallic refiectn g inner surface, which is removed from contact with the exterior of the said pipe, except at points where it is necessary to use supporting devices to equalize the air-space and retain the pipe and casing in their proper relative positions.

The second part of the said invention consists in protecting the reliectin g-casin g before described by means of an outer pipe or covering, which fully isolates the inner reflectingcasing from the earth or atmosphere and prevents injury to the same.

The third part of the said invention consists in the manner of constructing and applying the various members of the heat-retainin g covering, as will hereinafter fully appear.

In the further description of my said invention which follows reference is made to the accompanying drawings, forming a part hereof, and in which- Figure I is a longitudinal section of my improved heat-retaining covering for steam and hot-air pipes. Fig. II is a cross-section of the same. Fig. III is a cross-section of the said covering, illustrating a modified construction of a part of the same.

Similar letters of reference indicate similar parts in all the views.

A is the steam or hot-air pipe, and I3 the inner casing havingr an inner reecting-surface. This casing may be formed of tin-plate or other metal burnished, or it may be formed of nonmetallic material to the inner surface of which burnished metal is attached.

The outer casing is made of any suitable material, wood being preferred, and when wood is used the casing or pipe is constructed of staves a, grooved at their edges, with strips b inserted in the said grooves.

In order to insure water-tight joints hetween the staves a the strips b are made of thoroughly seasoned wood, and they are slightly compressed before being inserted in the grooves, and the edges of the staves and the strips may be treated with )itch or other suitable substance. The Wooden pipe is finally wrapped or handed in any manner to give it the desired strength and to bind the staves together, and coated with pitch. The sections of the wooden pipe or outer casing are connectedtogether by means of metal thimbles C C, which are tapered exteriorly from the center to .the ends `and driven into circular depressions or channels forlned in the ends of the wooden sections.

To equalize the distance to which the said thimbles shall penetrate the ends ofthe pipes, the thimbles are provided with an annular projection or rib, c, which rib also serves to strengthen the thimbles. Angular or curved thimbles are used when it is desired to form a bend in the wooden pipe.

I prefer to have the tongues or strips prepared independently, as described; but, it' desired, the staves may be formed with a tongue and a groove, so that they may be united after the manner of matched flooring.

This last-described mode of construction is represented in Fig. III of the drawings.

It will be understood that the heat-reflecting surface of the inner casing prevents to a great extent the said casing from conducting heat radiated from the steam-pipe, and the outer casing preserves the inner one against corrosion and the iniiuence of the earth and the atmosphere. Further, the wooden outer ing casing and an outer protecting casing, substantially as herein specified. 15

Il. A heatretaining covering for steam or hot-air pipes, consisting of an inner brightsurfaced heat-reilecting casing surrounded by a ton gued and grooved wooden pipe, wrapped or banded, and formed in sections united by zo thimbles, substantially as set forth.

HENRY M. FITZHUGH.

Witnesses:

DANIEL MANGAN, H. W. NEWKIRK. 

